What happened to sleeping through the night?

Ah, Andrew. He and his sister were doing so great snoozing consistently through the night for as many as 11 hours.

But the last few days he’s been waking up, or pseudo-waking up, every hour or two.

He’s not screaming, but he’s chattering, and if we don’t come in to plant his pacifier back in his mouth, he’ll escalate into a full-blown fuss. Sometimes, this will even wake up his sister, which is a big problem. The girl usually sleeps through everything and gets her crankiest when woken up from a deep slumber.

A couple times feeding worked. But more often, he’s not interested in eating. Often, his eyes aren’t even open. He’s approaching his 6-month birthday soon, so I wasn’t sure if this was a phase or not.

Am I making a mistake by attending to him when it happens? I don’t want Matilda’s sleep disrupted either.